Extended Data Fig. 4: Relationship between ice to rock mass fraction, f_ice, and predicted central heavy element mass fraction (ice plus rock), Z_in.

The red histogram shows the distribution of Z_in in models with f_ice < 1/3; the blue histogram shows the same for models with f_ice > 2/3. Models are from the baseline case and colored by log likelihood as in Figs. 2-3. For models with predominantly icy cores, the preferred value of Z_in is near unity, and vice versa.